Decision Variables that are not in the objective function
Hello everyone,
I'm writing a model where I must use variables that are not defined in the objective function but only in the constraint set. For instance, my objective function is in the Figure below:
In the constraint set, I have a constraint, for example, that take usage of a variable x_{ij}^{c}, which are not in the objective function. This particular constraint is described below:
At first, I thought that I don't need to do anything besides use the x[i][j][c] = model.addVar(); method. But It seems that the x_{ij}^{c} does not make any difference in the model after all, and then I added the variable with a 0 coefficient to the objective function in order to investigate if any difference comes out, but I was not successful.
So how do I use variables that are defined only in the constraint set?
Best regards.
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Hi Jose,
Defining variables without an objective coefficient is standard use. Maybe you are declaring your constraints wrong? Did you inspect the resulting model through the LP file?
Daniel
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